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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0bfd025b9cc26cea6aeafdc0bc168d8c2b5fb29b542989c33ab9089700cf3a' 
  AND token = '1fxg5I8af0GE8QHpMUIKPpyFWW8ih8WkE9QIS5EarH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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