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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee7797b930faa305f9f8b97313bd7ad2596ffd92bc1758fd344b60ff9b7a158' 
  AND token = 'FZFGIej2v69vSOl8bt9E6ONjWGHUsqOVI/BFDQVyUSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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