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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88998d3371c8a37c5080276ac6a23af422567814c24f8ac8fe6429adcee0d741' 
  AND token = '750s2QxWopPep/z91c+zs6XfF/hnZXdMcbTy6+djrLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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