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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a22fd04f5127b7238422690754beeae0a4e2b0029d7fcf9745aa851104faf6' 
  AND token = '8Geme53b8Mf5wyZDqp3J5Jce2CsQeGFzu8TNt0XgtQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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