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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255089d021657987909176d57af20d1d39e7be2a76e8c11955be653a58671b74' 
  AND token = 'FnmawFn6eIjrB8BCz0U+pn93Egs/96d1k6xrURYKY6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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