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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a5c185ff4825ac5107b813ad2ef64b58a14502835c5ad87c07c32dcab2c0fb' 
  AND token = 'YaXQs37gs5h0GOR9ARayaOiixAiph6bOSw+7g+a7iLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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