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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d093bbd463f8fc6e499e65098d4b5f44e1258430f4170f25a2f503f64d78e84' 
  AND token = 'sHbp7ePhkwZTwSDQ/fYUb27ycXuc36huzE91TTcds+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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