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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1b7138c2c82f303367f0b910fa60bcbbef960b7201967b2246d29e2e7d237b' 
  AND token = 'wsbHXBNItxziCKqeJ0TNlXgZ/46Pf1GHJFzcUudL6zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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