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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2056796d5d66097105692b7474812addea5f016b44c23b256069cc9ae2c9fdc7' 
  AND token = 'gb7xrPSYFYH9yqp+ExiQpvq2EYm8YbpHJdOUm8I5oyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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