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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516141a9d7f8eca84e487eb3fb5e77f3273a1ebb149adf4cfa982e7301f7e29a' 
  AND token = 'UGdVvqbKzntRPaWN3H69W6Rrhi91C6a7JtUk2dhh39U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}