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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41658721964a8b54a4a82aa1edd02fc9c238becfb746c7d9d4d4b07922587abd' 
  AND token = 'B5uxFLms6TgLP0fgFCdY4HsdyY7sGUsQH0USAzj+/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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