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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e2ea4cb3644a792d68445e0cc8d2463de55f2b95b96833deef84c7f47aab19' 
  AND token = 'FCwTbcG97fiQeoyEvE6eImFfkOA8F+51Yry7sbW38+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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