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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a165f4870185dd7a56a0dd40846448364a59811cea1044ae3062b1ce39057a' 
  AND token = 'Cz3ArNJGRcw1kEt5g5zjoXxUE/vkgrkGMPXoS1dujwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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