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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c740057cc33a0c080a17ca7bdbff351f59cf5e37034f92c47d18b0bc173338' 
  AND token = 'EyvEJz5/hEF4j9r4ccBzrauzHt3H4cNsDpoGBG3fK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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