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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bde8a5d03946779145a7f01d30a14ea1dde6bbc76e2c09e8afe17edc553684' 
  AND token = 'bZ9MHyWZsl5Mx5x0c5mzf1VYVqBA9Gsvsy/WFjYIXtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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