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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317ec361064af5a877ce42566665a43b352a0f21da745cb53726bee1ca23c9d6' 
  AND token = 'Y3pLMOE0RSI9bDkseDriajVzuQKNj6SCAYCbf9fewfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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