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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1254f948f58280636edcf9f9e15a2f305fee4e6fae9d40f692a89eff16031554' 
  AND token = '71D7Vm56CDxzrSJfg83oSxZd0M43ywwZ7Nn9hDwnfaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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