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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed2eaaba6432382991cf7cb7728a73631747a3b1478125297f209411df8745d' 
  AND token = 'Aa184E6D7dWPm4dhd2dsnu2kxmNW2a060XpJfvJ295Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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