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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6f452811190b5a10d0d4845ee10f83e1140aae09e9436f979e1f5a08b08523' 
  AND token = 'qiqzsTJQO2ndIx4t7lqzzoVXPjlIY8ZezvF7KsHFksg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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