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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036338e31436eba52c16a248c62d634767c733f96d05714a3c7ab6b9fd495862' 
  AND token = '6SvBwgdiLYrpTr8XSirCdxnbPgS4wM+pyFLSPsgyv2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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