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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823368d637ee0ebc544176f35ab39b81e4a020fbccac15d74967f57ad85b3b9d' 
  AND token = 'xG1U+3Eqp/yPmz3PdNiMYlahBDTHgfNSrXtk90+AiGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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