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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41988c36a5b5c3923c8ec0ffe9f8da683389d114989992a92972e62700a1f427' 
  AND token = 'RhdRXgz618agJ95C08aEBLoNpkFDsqd9lktVWzKY+bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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