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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0110158433913a1d4556006e5089c8e07f62e654592681faf260cb7a6bb19997' 
  AND token = 'XkWiabn9iUSOv2oLuEVgxis0hHx5/IrBISRz0Elmmdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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