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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d08bb800c2f454aa59f70597f0c15e890d04c8dc5fea1830eacc1b76d2e1a1' 
  AND token = 'JXZvSjuw0BJNWMHY7dfspwdTZrTniEuDvRx5qHL69hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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