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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb6ddc41aed89d102b967e22e10fea98d496d601cacc831f1a39d33a0538638' 
  AND token = '/Scz/6pruMHRkvO7tZZVqJ7ITKR9KwKkC0GmpejtmT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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