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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb061b85d23f766036ecfc293f8c99632bbe8f74aaac978b96b6d80a091e7a9f' 
  AND token = 'DcwRVcKFXI2P3wHRAgJ0cTYznZ7xPpt99+Rsej2V1+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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