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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3041445338c81aa6b3095867fcf22abc300bebc9218529c38d51be26e5c6bca8' 
  AND token = 'HZdo//EmUcdC0R2YaR9v15bv8cDLA6JKxnpBeA3croM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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