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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7c2408561dc98ea79a4f34ec84d04d97c77aa1087d6512eb2badab95dcc143' 
  AND token = '2aJ8oNkf/7TYhXOxRVgFU/ZnNZ/mdqiPeymuw8OX83Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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