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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc018c1817ec93b444b5b8125cb7433efd2faf6f880a680c03687d822c7ba0e' 
  AND token = 'iKrxy2dO/nS07z5ndICmqAb/1Mb5/s7zGcRs/NujP4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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