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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15fdb954497bf13c655824aca3aa7c7d03a88bd96f4964614ff7779ec39c208' 
  AND token = 'kNBdFrwsl2JeIdRWF8X8weNWzF3yWZrhJwr6tuidgnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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