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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb156eba261cc4827ff1c768a6dc7095a5d9fe6f857a51dc5fa11accaf30648' 
  AND token = '/3nH9v+P2uFlj97nrFXfzZ7F2T/5JrCc/YeqIqxH+t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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