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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c58a59b972dcca17b0180d99a709cc94b05aca049ebe8f7f06fb90e8d1e881f' 
  AND token = 'w+Eqhck1mdULiulF00GNWEJ4hYsQ14aKYt+i9eQc1tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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