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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa501b27d4a9f9a8949b1baba4cf7bc84d9460ad0675e9fe7ba2a68d80954ab5' 
  AND token = 'pn8OnBXT3kUwLxOITj3pt2CQI9lTUw8FmUMBbk+dS9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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