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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078bee6f93d33181d512d8190f96d1f762867123cb862d3146fe625fb780ea76' 
  AND token = '20T1ec8BpqhDLYtFGtypZikogpCKQDMWtFLuJVDAlHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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