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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79985f7967184774faca927e197323217b60e6714bdf4cd922e9681f5129d98e' 
  AND token = 'JMaQkio0Baql6k9HIrrdg/7grx75D4qBz3B5+IuTYhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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