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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8684a4b045efa7e2763d87c5fa3d1eb71885c092e71745e53d06c83d379dad60' 
  AND token = 'DFNtJnq7H1diSwgD4/0VYZ2ZF/DJyYbRzSl4SXVsS7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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