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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dc1148d575fae9a647761207a49e0cc05a7b12046c49a033ed39452c0dcd7f' 
  AND token = 'IN3xh2RkKXq0TwHRVA+isOpCy+/QNN7Re4mG3y3gRBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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