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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da87d5a8c7a3eb4fe9e3b9b88ff2d0a40028f6803460fb3465e6299900030ee' 
  AND token = 'UJJqTwf6bV8XAvjtBQ1IsEGcgdcbCxX+wrirl7QACZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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