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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e392c464e875345cbc8ba9e20fe2b3288411bd4b549b6a870f5ac3677e9dc72c' 
  AND token = 'wbYXAnnxLv/uto+IH9ataCj7oPrgIF4u5Itk5DaWTto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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