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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9885401213d95d01e5ca240a965da8d43804332b0920ade551cfcac57b8f50d5' 
  AND token = 'S9HMvLv6hL25WUWdonVCfOaJYNRs1nWw1/72C6FLbs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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