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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7fc4ec88eff35a338cf1f4f0ae52157588438f270c06854dd8383c44e2b43a' 
  AND token = 'X202tIgEJFLcNc9RGrQemOwBfnu++OTs8C5GRSPO90Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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