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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd616b18b5928c96fcd5c860bdb779f3d996cf386754136530907bce649de3ce' 
  AND token = 'oe7n9mrod5gWHkCoJ0zWibf9jilu5kLqqJqzOmIZR2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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