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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730e2ab4b7ca1bc99a6a99c3f107aba799ff4b5b2d7b35e58b576726a8d97e4b' 
  AND token = 'zm/KXY/e6uFf4Gxgy87/UWF3sLcduSIISrGPE6qri2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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