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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038c23cace1b867244e3c01bf6b9f233a8d94a7f95dcc6b9a0d03c20b855f5fe' 
  AND token = 'bfQyV4T3Xwtvs7n/yP9KUb7STH1euuwWn33zR75OyIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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