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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c157e58377cd2d29f1249c89ffb13f646400a06979bddbffc02df7aad916a29f' 
  AND token = '90spUUwpeUP0SPGHWM747EEjD1zjqrjIATCwIDwN1yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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