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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767e97f52b1deeeeec601db9211cd38cbc1b7e5a12e412f6e0766190943ba797' 
  AND token = 'OVqIcZC6ZqD45mthuz2RwFaXbVQAdoykFhiMFrWUXtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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