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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2347e66b9a90e9c60a567da1f141323991324e9df21283467d838d288d5f43d0' 
  AND token = 'Isv7MrK5gVhEmIm5/eT4tkzadVc4Zj3va7r4M5wGmZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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