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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35410a05dddb55f96833ccb26cedc5ef11ad8cf863e2b0b520663b7cc8ba4ec9' 
  AND token = 'EKu/N+R9lTamUWRzIxwRrX7w8e6EOr85JoDx9KR7gWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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