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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b29417529acab4ee5a1e4ac18f3a06faba7d93798ea5fd0dbe90d417498908' 
  AND token = 'JIlb1hzP1f6Qmy6a5eDgDllOUJ11au39h/OTQG7j3DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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