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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8292fb14c4d10d7de45e9d0b64d0a7969c9895d22f6f8a3f6db8e38c2bc1fd61' 
  AND token = 'hXYwEtCsgNxahdhKwX5aIWS59vcRmEhLzoEFOwsSeso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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