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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9b94f5fee3de8b67b793b4701c6b5165790ea75318dd58debefeb27a188245' 
  AND token = '0czgLFsKQNqkTBvDoFDBudu8YNVppk10D5I6y21APNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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