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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336fc0dc28f780ac0aef4bb336c32b78548f08ce17b01a240f1c1355ad7809d5' 
  AND token = 'SrsI5YSrp3T7MLvCWAemSuA7HphhbSUrvyKCItHor/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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