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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb94965279ddc1b392dca87c6ecc47d9eb9c2356fcb4c8b8d629f1b087b51107' 
  AND token = '0nOQ6khINhgW3sLvjAyD1ovvFqYS5Fk+bL4TfBS/t68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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