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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565e972d057a88a5bd1b4a9c76c96b849b7b13fd2ac7fd1fc9dd1466e52022fe' 
  AND token = 'RmFkSVn3otNNtdkvY2PkyES8z/kK4EphkVwimG9lwnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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