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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e0d1d25783f7bf5fab45523c80f08370b80f86722ed46dcc0c6d8cf1cf750f' 
  AND token = 'Kmme4DVrJq8FYIOesyEEcS2GEtihfJ+qobCv9qBt/ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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