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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50c93e0a05bc50559b79b5f6734c455b713b84f76ebd7f4f5ede148851a6dc8' 
  AND token = '3Y6vInTnP7RTCIo0iq84h6t9tjY5rqwRd0kgZEjCBtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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